Beta Build 13066 - Portals removed from Shattrath and Dalaran
Blizzard doesn't want you to use Shattrath and Dalaran as portal hubs anymore, the latest beta update removed all the portal to the cities and replaced them with class trainers.

This isn't a new change now, is it?
I'd say a much bigger thing is the removal of portals on 4.0.3a on PTR